Malicious PDF — malware analysis report

Static analysis result for SHA-256 623daa6ba06c9120…

MALICIOUS

PDF

44.4 KB Created: 2020-11-08 15:40:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 04db6d6547c04ae22b1d34ff7b04b827 SHA-1: a4cb6f712f77eb71ada54186e6a4735c620f8ec9 SHA-256: 623daa6ba06c912046d74dc0875045141f08a6da7541fcb7be1c4b94b027d8d7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, flagged as a link farm, and one primary URL that appears to be part of an SEO spam campaign. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to drive traffic to external sites. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafftec.ru/wb?keyword=hongos%20comestibles%20en%20mexico PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383322/normal_5f8d4e71108e8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://lirurib.files.wordpress.com/2020/11/39914543697.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/royal_high_school_threat.pdfIn PDF document text
    • https://tetululu.files.wordpress.com/2020/11/baloncesto_historia_y_reglas.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/ib_english_written_assignment_rubric.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/eyes_of_dr_tj_eckleburg_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/26309166359.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e450c0ae-2728-40f5-ad79-72b86aa85f87/17504802743.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/kabbalistic_magic.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/19385770084.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a5d9dd2-65e9-4eff-a68a-170d64d6cf7d/dinepezimu.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/vibosoroxukizoredokupo.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/fruit_from_a_poisonous_tree_book.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/lakobuwosag.pdfIn PDF document text
    • https://bokivonuko.files.wordpress.com/2020/11/29917440582.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B8E 4980 bytes
SHA-256: e64858f039da94c10de48fab7cf636c2abe385e2f17c054aa39d0f6c676e17a1
font_01_sfnt_off00007c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C7F 11956 bytes
SHA-256: 271a2d77c75bc55d648a23e6a6c67f9f03c46941b28ff0d331f66e77cd3df5de

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